Wood-Key Points for Wood Coatings

Key Point Note

Wood is divided into conifers and broadleaf trees, each with different characteristics affecting the method of coating. Solid wood and plywood are selected based on their unique properties for specific applications. Outdoor woodworking coatings require anti-corrosion and anti-fouling properties to maintain wood durability and prevent mold and biodegradation. To enhance the wood’s aesthetic, base wood coloring and coating coloring are combined. Special surface treatments are needed for broadleaf ring-porous woods to prevent uneven absorption. 

1. Wood Classification 

Wood is primarily divided into two types: conifers and broadleaf trees. Conifers grow in cold regions and have a fast growth rate, while broadleaf trees grow in warm regions and have a slower growth rate. In terms of wood planks, there are “masame” planks, which include the central axis of the log in their vertical cross-section, and “itame planks, which do not include the central axis. 

2. Cross-section of Logs and Characteristics of Wood 

The cross-section of logs shows growth rings divided into earlywood (formed from spring to summer), latewood (from summer to autumn), and the boundary of the growth ring. The structure of the wood grain differs between conifers and broadleaf trees, with broadleaf trees having a richer wood texture. Solid wood, which exudes a sense of luxury, is used for high-quality furniture, while plywood, stable against environmental humidity and temperature changes, is used for items like pianos. Solid wood and plywood are selected based on their characteristics, such as dimensional changes and moisture fluctuation control.  

3. Key Points in Woodworking Coatings 

3-1. Coatings for Outdoor Architectural Structures 

One area of woodworking coating involves protecting outdoor architectural structures, such as temples and shrines. The durability of wood is said to be as long as the tree’s age, and to maintain this durability, coatings that prevent mold and biodegradation are necessary. Coatings that allow the wood beneath to easily absorb and release water, and possess anti-corrosion and anti-fouling properties, are essential. Especially in high-quality materials used in construction, the durability of the natural wood finish is important. 

3-2.Enhancing the Beauty of Wood 

Another field focuses on making wood more beautiful for items like furniture, musical instruments, and fittings. “Wood grain” refers to the texture of wood that includes patterns and motifs. Coloring work is essential to emphasize this wood grain. In coloring furniture, shades of teak, mahogany, and walnut, which are among the world’s three most renowned woods, are often used to imitate and exude luxury. The coloring methods include direct coloring of the base wood and the use of colored clear coatings (color clear). For broadleaf ring-porous woods like birch, which can show uneven absorption when stained, special base treatments are used to create a uniform porous surface, improving smoothness and resulting in even coloring and distinct wood grain. 

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